China has included carfentanil and three related synthetic opioids in the list of controlled substances, China’s National Narcotics Control Commission said on Thursday.China has included carfentanil and three related synthetic opioids in the list of controlled substances, China’s National Narcotics Control Commission said on Thursday. The ban will become effective immediately from March 1. Like Us on Facebook The U. S. Drug Enforcement Administration (DEA) has hailed China’s ban on carfentanil and other opioids substances as a major ‘game changer’ in their fight against drugs consumption and overdose. “It’s a substantial step in the fight against opioids here in the United States,” said Russell Baer, a DEA special agent in Washington. “We’re persuaded it will have a definite impact. ” Carfentanil is considered 5,000 times stronger than heroin and 10,000 times more powerful than morphine.